Secular Change and Geographical Distribution of Summer Sensational Climate in Japan

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  • 日本における夏季の不快指数の経年変化と分布に関する研究
  • ニホン ニ オケル カキ ノ フカイ シスウ ノ ケイ ネンヘンカ ト ブンプ ニ カンスル ケンキュウ

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The objective of this paper is to clarify secular change and distribution of Discomfort Index DI during summer in Japan. Mean values of the calculated DI using AMeDAS data for every 10 years from 1961 were analyzed. As for the best DI maximum, Hokkaido compare 1960's and the other generations on a day, and all generations are high. As it is 2000's from 1960's so as to go south than this, the tendency that the generation when the best DI maximum throws it on a rise from a fall on a day becomes late is seen. As for the minimum DI maximum, the minimum DI maximum rises to Hokkaido, Tohoku region by a rise of the temperature on a day from 1960's to 1980's on a day. In the other areas, 1980's had many drops until 1990's in 1970's. However, minimum DI maximum is low, and the other areas tend to rise on Hokkaido, a day of Tohoku region in 2000's. Changes of monthly maximum difference between daily maximum DI and daily minimum DI in each city were calculated and compared. Japanese land was classified into 6 area based on that calculated change condition and its related distribution map was illustrated.

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